#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	while (scanf("%d%d%d", &a, &b, &c) != EOF)
	{
		if (a + b > c && a+c>b && b+c>a)
		{
				if (a != b && a != c && b != c)
					printf("%s\n","Ordinary triangle!");
				else if (a == b && b == c)
					printf("%s\n","Equilateral triangle!");
				else
					printf("%s\n","Isosceles triangle!");
		}
		else
			printf("%s", "Not a triangle!");
	}
	return 0;
}